Take the total weight of:
Upper and lower (steel) spring buckets/cups (which you can remove when going to coil-overs) + two 5" springs
Then take the total weight of:
Two (aluminum) coil-over kits that go on the shock + two 2-1/2" coil springs.
Multiply the difference times two and I think you will see the third advantage.
Since one end of the shock is connected to the "sprung" part of the suspension and the other end is connected to the "unsprung" part of the suspension. The weight savings affects both sprung and unsprung weights.
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